login
A188561
Number of nX3 binary arrays without the pattern 1 1 1 diagonally, vertically or horizontally
1
7, 49, 247, 1383, 7722, 42712, 237116, 1315783, 7300042, 40505756, 224748056, 1247024929, 6919195733, 38391539384, 213017628693, 1181940415631, 6558063227535, 36387785244039, 201899687047572, 1120251845376251
OFFSET
1,1
COMMENTS
Column 3 of A188567
LINKS
FORMULA
Empirical: a(n)=a(n-1)+11*a(n-2)+60*a(n-3)+89*a(n-4)+107*a(n-5)-75*a(n-6)-50*a(n-7)-157*a(n-8)+184*a(n-9)-91*a(n-10)+86*a(n-11)-35*a(n-12)+13*a(n-13)-14*a(n-14)+4*a(n-15)
EXAMPLE
Some solutions for 4X3
..0..0..0....0..1..0....0..0..0....0..0..0....0..0..0....0..1..1....1..0..0
..0..1..0....0..1..0....0..1..1....1..1..0....1..1..0....1..1..0....0..1..1
..1..1..0....1..0..1....1..0..1....0..0..1....0..1..1....0..0..1....1..1..0
..0..0..1....0..0..1....0..0..0....1..1..0....1..0..0....0..0..1....1..0..1
CROSSREFS
Sequence in context: A362392 A224150 A094430 * A225013 A228459 A203059
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 04 2011
STATUS
approved